EPANET is a Windows 95/98/NT program that performs extended period simulation of hydraulic and water-quality behavior within pressurized pipe networks. A network can consist of pipes, nodes (pipe junctions), pumps, valves and storage tanks or reservoirs. EPANET tracks the flow of water in each pipe, the pressure at each node, the height of water in each tank, and the concentration of a chemical species throughout the network during a simulation period comprised of multiple time steps. In addition to chemical species, water age and source tracing can also be simulated.

The Windows version of EPANET provides an integrated environment for editing network input data, running hydraulic and water quality simulations, and viewing the results in a variety of formats. These include color-coded network maps, data tables, time series graphs, and contour plots.

EPANET was developed by the Water Supply and Water Resources Division (formerly the Drinking Water Research Division) of the U.S. Environmental Protection Agency’s National Risk Management Research Laboratory. It is public domain software that may be freely copied and distributed.

EPANET capabilities:

handle systems of any size

compute friction head loss using the Hazen-Williams, Darcy-Weisbach, or Chezy-Manning formulas

include minor head losses for bends, fittings, etc.

model constant or variable speed pumps

compute pumping energy and cost

model various types of valves including shutoff, check, pressure regulating, and flow control valves

allow storage tanks to have any shape (i.e., diameter can vary with height)

consider multiple demand categories at nodes, each with its own pattern of time variation

model pressure-dependent flow issuing from emitters (sprinkler heads)

base system operation on simple tank level or timer controls as well as on complex rule-based controls

model the movement of a non-reactive tracer material through the network over time

model the movement and fate of a reactive material as it grows (e.g., a disinfection by-product) or decays (e.g., chlorine residual) with time

model the age of water throughout a network

track the percent of flow from a given node reaching all other nodes over time

model reactions both in the bulk flow and at the pipe wall

allow growth or decay reactions to proceed up to a limiting concentration

employ global reaction rate coefficients that can be modified on a pipe-by-pipe basis

allow for time-varying concentration or mass inputs at any location in the network

model storage tanks as being either complete mix, plug flow, or two-compartment reactors

EPANET’s Windows user interface provides a visual network editor that simplifies the process of building piping network models and editing their properties. Various data reporting and visualization tools are used to assist in interpreting the results of a network analysis. These include graphical views (time series plots, profile plots, contour plots, etc.), tabular views, and special reports (energy usage, reaction, and calibration reports).

Hello,
In reality in water distribution systems, when flow into the system is stopped,emptying of the network is a gradual process and when flow is reinstated, refilling of the system happens also gradually. I have tried EPANET 2.0 and WaterGems but they both show instantaneous emptying and refilling of the network systems.
Are there any models that depict this gradual emptying and refilling of the network systems under the above situation?

It is true that when flow into the system is stopped,emptying of the network is a gradual process and when flow is reinstated, refilling of the system happens also gradually.

Epanet software can do what you want provided you set time steps which range from 1 to 24 hours. The interval are restricted to an hour inerval and it is useful to give out a picture of what is going on in the system.

Hello.
EPANET (Version 2.00.12 downloaded from http://www.epa.gov/nrmrl/wswrd/dw/epanet.html) was designed to run under the 32-bit Windows 95/98/NT operating system. The EPANET Programmer’s Toolkit was also designed to run under a 32-bit Windows operating system.
So, my question are: is it okay to run EPANET and EPANET Programmer’s Toolkit (32-bit, both stated previously) under a 64-bit Windows 7 or 8 operating system ? Or will I have problems in the future with these programs ?
Thank you.

I am using epanet dll in my VB.Net application. It’s working fine when performing demand-driven analysis of water distribution system. However, when performing pressure-dependent analysis, the resulted demands include both the actual demand plus the set demand which in return affects the flow in all links. Is there a way to get only the actual demand when running the pressure-driven analysis? Thanks you